Doubt in between code

#1

why we write …?
N=N-1

IN THIS CODE
#include
using namespace std;

int main(){

int N;
cin>>N;

int no;
while(N>0){

cin>>no;
cout<<no*no<<endl;
N=N-1;

}
return 0;

}

#2 
while(N>0){

cin>>no;
cout<<no*no<<endl;
N=N-1;
}

As you while loop will execute until and unless the value of N is greater then 0, so if value of n is bigger then 0, then we have to decrement it and that’s why we are using N = N-1 that means , if value of n is 3 then after one execution value of n will be 2 and so on until it’s value become equal to or greater then 0.

#3

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